[time-nuts] The home time-lab

Bob Stewart bob at evoria.net
Mon Jul 25 16:15:15 EDT 2016

Charles, I can't speak for Brooke, but I have to point out that each of us has different needs when it comes to powering our lab.  For myself, if I lose power, that's OK.  I'm retired selling a few GPSDOs here and there and working on some other stuff, so I don't need a 24/7 operation.  What I'd like to get rid of are the occasional spikes out of nowhere on my test results.  Are they from the power line?  From the DUT?  From the test equipment?  So, for that reason, I ordered a Sola xfmr.  I haven't hooked it up yet, because I was offered a pair of free APC Smart-UPS 700 units, sans batteries.  It seemed reasonable to put batteries in one and see exactly what it would do.  I've done a power cycle test, and later this year the power company will provide the source-switching tests accompanied by phase jumps and transient brownouts.  I suspect the UPSes won't quite stand up to that, but we'll see.  If they don't, then the Sola will be connected in.  If I really got serious, though, I think I'd look into Solar System stuff, such as an inverter, a lead-acid battery bank, and a suitable battery charger.  But, as I said: I'm retired, and the budget just isn't there to do what might be the right thing to get clean power 24/7/365.


      From: Charles Steinmetz <csteinmetz at yandex.com>
 To: time-nuts at febo.com 
 Sent: Monday, July 25, 2016 2:34 PM
 Subject: Re: [time-nuts] The home time-lab
Brooke wrote:

> But a relay switched UPS, like mine, does nothing to the line waveform,
> so the Sola offers a lot of improvement.
> Since the Sola does not help getting a sine waveform, it may be better
> to put it on the input since that might make dropout detection more
> reliable?

Instead of continuing to fiddle around with two sort-of partial 
solutions that do not actually solve the problems, why not just buy one 
or more proper online UPS boxes?  Several of us have mentioned specific 
part numbers, where you can look for them at decent prices, and how to 
maintain and care for them.

This alternative would solve decisively the problems you (and Bob) are 
seeking to solve, and the cost is not extravagant (it would be even more 
economical if you hadn't already bought the offline UPS and the CVT -- 
perhaps you can sell them to recover some of the cost).

It is details like these that distinguish a "home time lab" from "a 
bunch of test equipment in the basement."

Best regards,


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